Center testing indicator



Nov. 21, 1933. T. H. GEbRGE CENTER TESTING INDICATOR Filed May 28, 1930 INVEN'IOR.

Ty B 3 m F ATTORNEY.

Patented Nov. 21; 1933 V I 1,936,160

stamp srares earner series f;

Y lssaiec CENTER rearms nmroa'ron Theodore George, Qieerc, Ill; 7 Y- Application May 28, 1930. vlle. 456305 4 Claims. (crea -172i My invention relates to center testing indicators er part passing through -.an aperture in the.;.end' and has for its object the production of a center of tubular member 17 as shown, by means of which testing indicator for use in lathes, milling, grindthe pin 2c is held from passing out of the end of ing and other machines which may be associated said tubular member 17. Said pin 20 is resiliently '5 with any of the usual, types of dial gauges and retained in the end of said tubular member 17 60 which will enable the operator to test the lathe by means of the spring 22 one end of which fits .1;. center as well as to accurately and readily ceninto the slot 23 of the shouldered part 19 of the trally locate the piece on the face or operating pin 29 and the other end'of said spring 22 similarplate of the lathe or similar machine, or quickly ly fits into a slot 24 of a plug 25 which is forcedetermine how much said piece of work must be fitted into said tubular member 17 as shown. The 65 moved to bring it to its central location, or how purpose of putting the ends of the spring 22 into in; much must be cut off the exterior surface of a the slots as shown is to keep the pin 20 from any cylindrical piece to bring its cylindrical surface undue rotating when the conical point 21 of the true with the center line on which the piece is to pin 26 touches the setting up marks on the piece be surfaced, as for instance, in a piece that was of work 3 when said piece is rotated on the face 70 previously turned 01f in a lathe and then hardened plate 2. and mounted in a grinding machine to be ground Plug 25 has headed cylindrical part 26 which down to proper size. contacts with the end 27 of the plunger 280f the A further object of the invention is the producdial gauge 29. Dial gauge 29 has a rod 30 pro- .ltion of a center testing indicator of this character jecting from it which passes through an aperture 75 which is simple in construction, reliable and effiin frame 13 as shown where it is locked into pocient in operation, easily read and very sensitive sition by means of the screw 31. in action and. one that is inexpensive to make. It isevident, from an examination of Figure 2,

I accomplish these results by the means shown that if the bottom of the pricked conical mark -in the accompanying drawingin which: shown on piece 3 is not on the absolute axis of 80 Fig. 1 is a top view of my center testing indirotation of the lathe spindle that carries the face 'cator mounted on an ordinary machinist lathe. pla 1 1 21 will move up and down as Fig. 2 is a front view of Figure 1 showing my well as sidewise and this'up and down motion will center testing indicator in partial section along be communicated to the dial gauge plunger 28 30 a line 1-1 of Fig. 1. by means of head 26 of tubular member 17 and 85 7 Fig. 3 is an enlarged partial sectional view n 2'? and b ind c d by the dial h nd h wn.

along a line 22 of Figure2. If it is absolutely on said center of rotation it is Similar reference numerals indicate similar evident that no motion will be communicated to parts throughout the several views. the and indicated on the dial. In the drawing 1 represents the bed of a ma- In pra i my n r testing in r m y 90 chinists latheand 2 is the usual face platehaving be used to test whether the live center of the roa piece of work 3 mounted on said face plate. 4 .tating lathe head runs absolutely true as is well is the carriage of the lathe which is usually mountunderstood by any machinist, orit may also be edon the bed 1. Carriage 4 carries the tool post used to, Set 1 a p 'o WOYK i Which it is nec- 4025 hi h h s the usual bolt 6 by'means of which essary to bore several apertures the sides of which the tools or other devices are held in the slot 7 must 3 parallel with a o r and it of the tool post 5.. 8 isthe holder part of my cencertain distance apart. In this last case the center testing indicator which holder has the cylintral points of the apertures are laid out the cordrical clamping part 9 shown with the slot 10 rect distance apartand prick punched at each and the screw 11 by means of which said clamppoint when one point is located in the face plate 9? ing part holds the sleeve 12. Journally mounted as shown in Figures 1 and 2 and the aperture in said sleeve 12 is the frame 13 which is adjustabored. Then the second mark is similarly cenbly and movably held in position by means of trally'located and the second aperture bored. the shouldered screw 14 as shown. Frame 13 has It will be understood of course, that while I an aperture 15 in which is pivotally mounted by have here described one form of my invention, I 9 3 means of the pointed screws 16 the tubular memdo not wish to limit myself to. the exact form ber 17, as shown in Figure 3. Screws 16 are held shown, but desire to have it taken in a sense ilin position by means of the lock nuts 18. lustrative of any and all the forms of same as Slidably mounted in one end of tubular member will come fa rly within the scope of the append- 5 :17 is the shouldered part 19 of a pin 20, the smalled claims. 7 v

I claim:

1. In combination, a holding means, a frame having a plurality of apertures journally mounted in said holding means, a tubular member pivotally mounted in one of said apertures, a pin mounted in said tubular member, resilient means positioning said pin in said tubular member, and a dial gauge adjustably mounted in the other aperture of said frame and positioned to co-act with said tubular member.

2. In combination, a holding means, a frame having a plurality of apertures journally mounted in said holding means, a tubular member pivotally mounted in one of said apertures, a pin slidably mounted in said tubular member, resilient means positioning said pin in the end of said tubular member, and a dial gauge adjustably mounted in the other aperture of said frame positioned to co-act With said tubular member.

3. In combination, a holding means, a frame having a plurality of apertures journally mounted in said holding means, a tubular member having a flanged retaining end pivotally mounted in one of said apertures, a pin movably mounted in said tubular member, resilient means positioning said pin in said tubular member against said flanged retaining end, and a dial gauge adjustably mounted in the other aperture and positioned to co-act with said tubular member.

4. In combination, a holding means, a frame having a plurality of apertures journally mounted in said holding means, a tubular member having a flanged retaining end pivotally mounted in one of said apertures, a shouldered pin having a conical point movably mounted in said tubular member, resilient means positioning said pin in said tubular member against said flanged retaining end, and a dial gauge adjustably mounted in the other aperture and positioned to co-act with said tubular member.

THEODORE GEORGE, 

